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Three identical metal balls A, B, and C are mounted on insulating rods. Ball A has a charge +q
and balls B and C are initially uncharged (q is the usual symbol for electric charge). Ball A is
touched first to ball B and then separately to ball C. At the end of this experiment, the charge on
ball A is
A. +g/2.
B. +q/3.
C. +q/4.
D. none of the answers

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